M-Jet 35 Release! 3D Printable Jet Pump For RC Boats
ฝัง
- เผยแพร่เมื่อ 15 ต.ค. 2022
- Buy the M-Jet 35 files:
www.cgtrader.com/3d-print-mod...
Complete PDF manual: drive.google.com/file/d/1d3b9...
Part list: docs.google.com/spreadsheets/...
M-Jet 35 Full Build video:
• M-Jet 35 Full Build
M-Jet 35 Installation video:
• M-Jet 35 Installation ...
M-Jet 35 is the result of one year long development. It is the follow up after my successful M-Jet 30 project. It is improved in all areas and delivers the best performance I have achieved to date.
During the M-Jet 35 development, over 100 design combinations were tested and measured. Thrust, exit velocity, efficiency, power consumption and output power were measured and compared to achieve the best result possible.
Full playlist showing the development: • M-Jet 35 Development
The M-Jet 35 features two original and innovative design elements I have never seen used before:
The M-Jet single blade impeller greatly improves efficiency, while maintaining the superior 2-stage priming behavior, and is fully balanced by built-in counterweight.
The M-Jet 4-path nozzle dramatically shortens the pump assembly, improves durability, raises efficiency thanks to ultrashort flow path, and brings in nearly zero backlash steering control. - ยานยนต์และพาหนะ
That shot of the boat landing in the water then jumping right back out of the water is impressive!
I knew that you can do RC boats really well but I didn't know just how good you are at filmmaking. Great editing!
Thanks! The video took a lot of work😅
I've been following Stepan's designs for a couple of years and this is a culmination of several ingenious improvements of the axial jet drive. The stator with it's abbreviated fins, the super-efficient single bladed dual stage impeller, and the innovative steering nozzle with simple trim adjustment are all vast improvements to conventional design. And the professional, well thought out displays and directions are second to none! Bravo, Stepan my hat is off to you!
Thank you very much!
You said it better than me! I agree. Somebody needs to pay this man and develop this thing for big boats! man that would be bad ass! Maybe the new Tesla Jet sprint? LOL
@@JeffJackson86 Haha I would love to! Maybe one day:)
I dont know which to compliment first, your design or your video editing... I'll be building one this winter!! wow
Amazing boat! It's on my list! You are a good designer. What you did is very impressive!
You out did your self with this one, Štêpán! It was amazing to see some of your development up to this point!
Thanks a lot! I am very happy with it myself😊
Fantastic work as usual Stepan!
Really good jet pump it keeps getting better and better.
hey man, found your channel a couple of mounths ago on my way through 3D-Printing-TH-cam and seeing how you were able to get so significant improvements over your desings without changing much of the electrics really motivated me to desing and print my own rc jetboat and pump. i´m on my Version 3 (only counting those that actually survived more than 3 min) and it has been a lot of fun. I just wanted to say thank you for the inspiration. Greetings from Germany :)
Nice!👍
@@mjetdevelopment And also i`m curious, did you do any CFD-Symulations or just experimenting (and maybe some calculations)?
@@1sqeeze1 Yes, I did some tests in ansys fluent. You can find some screenshots from it if you click on my channel, click community (the non-video content) and scroll all the way down
@@1sqeeze1 And I did huge amount of calculations of the pump based on experimental thrust measurement during the development process, I measured over 100 different design combinations and plotted all parameters in an excel sheet
@@mjetdevelopment aah, didnt see that yet, i assume you used a student license right? I`ll try that too then, when i worked the other bugs out
killer video!!
that video was excellent :)
Zlaté české ručičky👍🇨🇿
I am just having a nice evening with the owner of this channel and i think, that all of you just have to buy his latest model of sprintboat, because it is just awesome
:D
Fantastic!.I need a 80 mm Version 😋
So I finally made the M-Jet 30 work in my water gun and you go ahead and release the 35. But DUDE! It TOTALLY works! 9 meters without any optimisation or even an active water supply from the backpack! I've only tested the wand so far, so I am very optimistic about it.
Hey man you cant stop me😂 Sounds fantastic! I would be interested to see how you did it😀
Will you make a full size version of this? Could be very interesting and ground breaking!
Maybe one day:) though there are many things working very differently at full scale.
Nice transistion as :48 seconds!
Thanks:))
Maybe next you could make a new and better 3d printed hull with this jet pump build into it as a upgrade over the mjet sprint.
Yes! It is a good idea, and I might do it at some point. But I am not planning to do it yet😀My only plan right now is to take a bit of rest!
@@mjetdevelopment good idea you are pushing a lot of ideas out maybe some rest and then even better. (If it is poseble
Only thing missing is a reverse thrust bucket, all that speed and no brakes! Makes no difference, I;ll still be straight on to CG Trader as soon as this month's wages drop into the bank, can't wait to fit 2 of these to my SAAB CB-90
I need one.. the boat that is - some of us don't have printers and I want to know how can I order one straight from you?
Incredible jet 👍🏼👍🏼👍🏼👍🏼👍🏼
Hey, if this goes make a update file to print for proboat Jetstream! On this price I saw this m-35 round 50bugs are perfect and will make this incredible boat like super boat and people like ironclad rc will love ❤ you for!!!!
It is only a idea 💡
Thanks! The M-Jet 35 Jetstream mod is in the works:)
Really a great drive. I installed two M-Jet 30 in my last boat and they run great. As it's a big boat and therefore heavier than small jet boats, I'm planning to use the M-Jet 35 for a future model. It is important to me that the boats can reverse. Would it be possible for you to develop a reverse plate for the jet?
Glad you are happy with the M-Jet 30!
Unfortunately, so far I am not planning to develop any reverse bucket for the M-Jet 35. Reasons are:
1) I myself never found the need for a reverse bucket, because it is possible to just steer at high throttle and turn basically 180° in place
2) In the very few cases when reverse is necessary, it is possible to just spin the motor backwards, pumping water in the opposite direction. This is not optimal, but still works as a slow reverse.
3) Adding a reverse bucket for the M-Jet 35 would add quite some complexity of the assembly, which goes aganist the philosophy of the pump.
I still understand that some people prefer the reversing bucket anyway - I might get to designing it in the future, but so far it's not on the list.
@@mjetdevelopment Thanks anyway. I will still look forward to build the drive. The M-Jet 30 is already powerful, so I can hardly wait to install the M-Jet 35.
What size 3d printer do I need to print the jetboat?
I assume you are talking about the M-Jet Sprint:
www.cgtrader.com/3d-print-models/hobby-diy/other/m-jet-sprint-3d-printable-rc-jetsprint-boat-model
For the Sprint, you need minimum build volume of
185mm x 150mm build plate x 200mm height
There is a lot more information in the manual:
drive.google.com/file/d/1JXAqPCIegU0TW2XvNSiWBZ-T3o3yTSlP/view?usp=sharing
Would it be possible to scale this up to be used on a jet kayak?
Scaling it up is difficult and comes with some problems, mostly because dimensions of all hardware scale up too. This can result in non-existing dimensions of bearings, etc. Motor mount becomes incompatible.
With some effort, it is still possible to scale it up - especially if you use a nice number like 200%.
You could also consider looking at the M-Jet 60, which comes with a STEP file:
www.cgtrader.com/3d-print-models/hobby-diy/other/m-jet-60-3d-printable-jet-drive-for-electric-surfboards
pretty awesome how you have created this hobbygrade++++++ design that is the most innovative thing in this scene since sliced bread especially your 2stage single blade counter balanced pump design. But you still removed that hexnut with pliars XD like!!! whaT?
Actually you are not the first one making jokes on that😂 But these are my favourite pliers so I started to use them for everything! Thanks for your kind words man:)
Hi I’ m planing to make an electric surf board, do you think it is possible to scale it up a lot ?
You can try to scale it to 200%, yeah.
But keep in mind there are many problems coming with the scale-up: All tolerances will get changed, motor mount will be incompatible, and it might generate some non-existing hardware sizes, like bearings and seals.
If you can solve these problems, it is possible.
Awesome engineering!!
I’m asking myself why you’re using this 4 path nozzle, is it to reduce the rotantion of the water stream cause by the props rotating, just like a stator would?
The function is exactly the same as a regular jet pump stator has, it removes most of the water rotation caused by the impeller. Also it reduces the flow area, which accelerates the stream.
A conventional jet pump stator has vanes, which stabilise the water stream, and obviously, they divide the stream into multiple sections. Then, as the vanes end, the water streams are joined together again in the center to pass into the steering nozzle.
My approach with the 4-path nozzle started as an idea, that there is no point of joining the streams after they are divided by the vanes. The advantages are following:
1) After passing the wide impeller hub, water is not forced to return back into the center, instead continues on its natural radial path. Less curves in the flow path, more efficiency.
2) This leads to the flow path being around 2* shorter than before, decreasing the friction on walls, increasing efficiency.
3) Paired with the new M-Jet steering system, the whole assembly is at least 30mm shorter, which improves durability and lowers weight.
@@mjetdevelopment that’s great, I have never seen something like this before and I like the thoughts you’re putting into your project.
Buy how much did the efficiency increase compared to a normal nozzle with a stator?
And would it be ok if I use this nozzle design for my Dive-Jet?
@@3dprintcnc164 Based on a number of measurements, the efficiency improvement is over 30%. Yes you can absolutely use the idea for your Dive-Jet! Though I won't mind if you give me a little credit:)
@@mjetdevelopment thank you very much, of course I’ll give you credits👍🏼
@@mjetdevelopment What is the secret to this perfect stream of water? I adapted the design to my application, but the stream isnt nearly as perfect. With my nozzle the area is reduced by 35% which could be not enough to guide the water..
Hi Stephan, I am planning to give a list of links to my wife for the plans and components needed to build your M35 design as my Christmas present this year 😁. I saw where you posted a link somewhere to the motor you used. Could you please list links to the motor, cooling jacket, speed control and batteries you used all in one place so I can show her. There are so many choices. I would just like to get what you already know works well.
Hi, nice idea:)
I bought the 3674 1200kv motor and cooling jacket from RCJuice:
www.rcjuice.com/motor-esc/brushless-boat-motors/hobbystar-3670-4-pole-brushless-sensorless-boat-motor-waterproof.html
www.rcjuice.com/motor-esc/motor-cooling-jackets/hobbystar-water-cooling-jacket-for-boat-motor-46-5x44mm.html
The motor depends on hull choice though. If you build bigger hull than me (over 50cm), then a 4070 will be better.
My particular 120A Turnigy ESC is from hobbyking and is not sold anymore, so I am posting two different links for choice:
www.rcjuice.com/motor-esc/boat-esc/hobbystar-brushless-boat-esc-130a-3a-sbec.html
hobbyking.com/en_us/turnigy-rc-boat-esc-120a.html?queryID=0dd8da8386b0f062416b48b4d37a7032&objectID=73854&indexName=hbk_live_products_analytics
And I ordered my batteries from a local supplier, it will be better if you find a local store as well. I used 6S 2600mAh 70C graphene LiPos.
For example these seem to be good packs, just make sure it will not be too heavy for your particular hull:
www.rcjuice.com/lipo-batteries/6s-22-2v/hobbystar-3500mah-22-2v-6s-60c-lipo-battery.html
hobbyking.com/en_us/graphene-3000mah-6s-75c.html?queryID=d3e50318fa9d2ca64f8fedcd660c0ce1&objectID=75684&indexName=hbk_live_products_analytics
Perfect ! I’m planning to build your hull too. Thanks for the fast reply, I’ll give her this list and patiently wait for Christmas morning 😁😁
If you made the M jet-35 and the M Jet-60 the same size, using the same motor and battery, even while the M jet-60 uses dual jetdrive/2 impellors, wich one would provide more thrust?(Im thinking of making a electric surfboard and I want to know if I should scale the size of the M-jet 35, only if it is more powerful than the M-jet 60 (when they are the same size)), dang thats a lot of parentheses..., so wich one is more powferful while The M jet 60 uses dual jet drives/2 impellors and the M-Jet 35 uses one impellor?? another way is, having the same rpm the jet drives, while being the same sizes, what is the rpm to kg of thrust for each jet drive while being the same size?
The M-Jet 35 is newer and is designed better than the M-Jet 60 in every way. Even though I am not sure how exactly the M-Jet 35 would perform after the scale-up, it is very likely that the upscaled 35 would have better thrust, exit velocity, efficiency and lower power consumption.
Regarding the impellers - yes the M-Jet 60 has two stages ~ two impellers. But the M-Jet 35 has two stages as well, it just integrates the two impellers into one part - the "two stage single blade impeller" as you can see in the animation.
The problem is, upscaling the 35 from 35 to 60mm will generate weird bearing dimensions. Scaling the 35 to 200% to 70mm makes more sense, you will still run into some problems with sizing but probably solvable.
What printed hull does this fit on?
I havent designed any fully 3D printable hull for the M-Jet 35. The 4G hull in the video is carbon fiber, and there are free plans for it here:
www.cgtrader.com/free-3d-print-models/hobby-diy/automotive/4g-sprint-hull-for-rc-boats-2022
If you wish to 3D print the whole hull, you can try searching for a compatible hull design yourself, or look at what the community has created. For example, there is this huge hull created by Jeff Jackson:
www.thingiverse.com/thing:5569969
Can it all be printed in plastic, or are there metal bits (rotor) apart from skid plate and intake?
Best in ABS or PLA?
Also, motor diameter?
There are 3 non-plastic parts I used apart from basic homemade hardware like driveshafts: impeller, ride plate and intake grate. You can print these parts in plastic and it will work. There is also a separate impeller file for printing in plastic. But overall durability of these 3 parts will be worse.
As printing material I used CFPC. Using PLA or ABS is possible, depends on you.
Motor size from 3660 to 4092.
There is a lot more information to all these questions in the full PDF manual, and also in the M-Jet 35 full build video - link for both of these is in the description.
@@mjetdevelopment Thanks for that. Looks like a great design. I'm thinking about making two for a manned micro boat.
@@OzAndyify Glad you like it! The M-Jet 35 might be too small for a manned boat though. It depends how fast you would like to go, but generally my older M-Jet 60 could suit this purpose better:
www.cgtrader.com/3d-print-models/hobby-diy/other/m-jet-60-3d-printable-jet-drive-for-electric-surfboards
Alternatively you could also try resizing the M-Jet 35 to 200% to 70mm, but this is not tested and I cannot predict the result.
@@mjetdevelopment Thanks! That one looks a tad simpler and it should scale up OK. (cheaper too). I've got a Turnigy Aquastar T20, 56mm diam motor that can put out nearly 5kw running 10s and 730 kv. Looks like I can make the mount work with min changes.
I plan to make a very light foam stepped hull with low hull loading to get min planing speed. I'm not expecting much, but should be fun.
@@OzAndyify Yeah sounds good👍
I know this might seem a silly question but, how slow can it go?
As slow as you want, this is only limited by how slow your electric motor can turn
Really good. I need a boat 500mm< but jet soooo expensive. Can you create some cheaper then that boat. If you need help we can do this.
I understand! Then the M-Jet 30 might be for you, it is cheaper and still a very good unit.
www.cgtrader.com/3d-print-models/hobby-diy/other/m-jet-3d-printable-jet-drive-for-rc-boats
Also if you want to print a whole boat, then look at the M-Jet Sprint:
www.cgtrader.com/3d-print-models/hobby-diy/other/m-jet-sprint-3d-printable-rc-jetsprint-boat-model
@@mjetdevelopment So I can use the m-jet30 pump for this boat?
@@user-id1cd7sz1w If you mean the 4G sprint boat in this video, yes!
The M-Jet 30 will fit very well into it. The 4G sprint hull files are free and you can build it from fibreglass or carbon fiber:
www.cgtrader.com/free-3d-print-models/hobby-diy/automotive/4g-sprint-hull-for-rc-boats-2022
The M-Jet Sprint I posted
www.cgtrader.com/3d-print-models/hobby-diy/other/m-jet-sprint-3d-printable-rc-jetsprint-boat-model
includes its own pump.
@@mjetdevelopment thanks. can I use the engine from M-jet Sprint?
@@user-id1cd7sz1w Yes if you have a 3660 size.
Any cheaper options with this because this would work amazing on my jet boat I am making but can you jsut put on the end part and will it still work because my 3d printed jet boat already comes with a a hole in the bottom were it comes through
It is a amazing design how long did you work on it ?
Thank you for your kind words:) The development of the M-Jet 35 took me little over one year. And yes! This is a cheaper option you might like to consider, my previous M-Jet 30: www.cgtrader.com/3d-print-models/hobby-diy/other/m-jet-3d-printable-jet-drive-for-rc-boats
Oh now I see why cost so much what is the difference between the 2 is this on better
@@baconbulldog5250 The M-Jet 30 is a good pump already, and when I was using it back then, I was very happy with it. But the M-Jet 35 brings everything to a new level, the amount of work that went into it makes it better in every way. The difference is captured in the price.
I am thinking of buying that one now plus would fit on my 1/8 scale jet boat ?
Hello, my boats nose is pushing in the water when i am using it how csn i fix this?
Is this in the mod folder.
Hi, are you talking about the M-Jet Sprint boat? Unfortunately I dont have any "smart" fix for this. Some things you can do: Probably you will need to use a lighter battery and mount the ESC as far backwards as possible to push CG towards the rear. Also use the standard first stage with ride plate that does not have any additional lift.
brother where can i get the jet pump
I sell 3D printable files for it:
www.cgtrader.com/3d-print-models/hobby-diy/other/m-jet-35-3d-printable-jet-pump-for-rc-boats
You can 3D print the pump for yourself. Or if you do not have a 3D printer, there are plenty of companies that can 3D print the parts for you.
Ok how do I get the parts needed to be 3d printed in metal since the prop is metal?
Yes, getting the impeller metal 3D printed is the best option. There is very detailed information about all of this in the manual:
drive.google.com/file/d/1d3b9momWcgAeUAn5o1v0-QZcIMYy4U90/view?usp=sharing
@@mjetdevelopment thanks again for the information. How much did it cost you to build one jet drive in total and do you sell the hardware kits and if so how much would it cost? I've bought and built one of your earlier models and built the whole boat but I haven't had any time to finish it up and I'm doing a couple mods to the water cooling by adding a piece of cut up antenna in between the jet drive and the one the tubing goes to inside the boat because the nipples snap off very easy.
@@martinconley4489 I dont sell hardware kits, you need to self source the parts. The build price obviously depends on your location and everything. For me, parts for the whole unit cost under 80$. The metal impeller is the most expensive part.
I am aware of the issue with the printed cooling nipples easily breaking. The M-Jet 35 has this issue solved.
@@mjetdevelopment how does a 3d printed at 100% infill impeller work as I'm sure you have tried it. Possibly in nylon or another high temperature filament that is strong enough to hold up.
@@martinconley4489 Yes I did most of the development with plastic printed impellers, PLA. There is also a plastic impeller STL in the files, which has thicker blades to hold up. It has worse performance and questionable durability, but it works.
Hallo can i buy such a boat ? Greets Andreas from Gemany
There is no option to buy it. But you can buy the files for the pump, 3D print it and build it for yourself. Then you can freely download all files necessary to build the hull.
Links:
www.cgtrader.com/3d-print-models/hobby-diy/other/m-jet-35-3d-printable-jet-pump-for-rc-boats
www.cgtrader.com/free-3d-print-models/hobby-diy/automotive/4g-sprint-hull-for-rc-boats-2022
What was the cost to have the impeller 3d printed in aluminum?
Around 50$. And even less per one, if you order two of them. There is some more information about the impeller on page 8 in the manual: drive.google.com/file/d/1d3b9momWcgAeUAn5o1v0-QZcIMYy4U90/view?usp=sharing
@@mjetdevelopment Thank you for the quick reply. $50 is much cheaper than I expected.
Are the 3D plane free?
For the pump, no. For the hull, yes.
I wanna see what happens if we put this kind of jet designs on a bigger scale I'm talking jet racing boats full size
Yeah it would be awesome if this got an opportunity to be tested on something full scale. But things are a lot different at full scale, partly because water boundary layers don't scale up. For example the single blade impeller would probably make no sense there, but the 4-path nozzle could bring some advantages.
Interesting design, you'd think a consolidated cone of water would have better results, obviously not great work brother in boats
Straighter stream is more efficient in theory. But price for consilidating the water cone is generally making the nozzle longer, or adding some kind of vanes. Both of there options add friction on walls. During the development, I measured many setups and found out, that none of these options are worth it. Thanks for your kind words:)
Celkem by mně zajímalo jak se bude měnit rychlost a síla výtrysku s narůstající rychlostí lodě. Rychlost výtrysku by mněla vzrůstat protože se zvyšuje rychlost kterou jde voda do sání, ale síla by mněla klesat protože se zmenšuje rozdíl mezi rychlostí výtrysku a rychlostí lodě.
Přesně tak. Síla (tah pumpy) lineárně klesá s rychlostí lodi, protože se zmenšuje rozdíl mezi rychlostí výtrysku a rychlostí vody v jezeře.
Je logická také úvaha, že s narůstající rychlostí lodi bude narůstat průtok pumpou, ale experimentální data (já to neměřil, ale několik různých lidí ano) ukazují, že tento efekt je mnohem menší, než by se dalo čekat - zvýšení průtoku je pouze v rozsahu 0%-15%. Toto je pro mě překvapivé a stále se snažím tomu více porozumět.
Každopádně, pro dosažení vyšší rychlosti lodi je naprosto zásadní rychlost výtrysku, a to i při statickém testu - a proto jsem jí v poslední verzi designu zvýšil až na 70 km/h, i když to bylo částečně na úkor statického tahu.
Když bych ignoroval to zvýšení průtoku a rozepsal to:
Předchozí verze M-Jet 35 měla 7.4kg statický tah a 58km/h výtrysk, nová verze 6.8kg statický tah a 70km/h výtrysk. Ale jakmile loď jede alespoň 20 km/h, tak se tah při jízdě srovná na 4.8kg a následně nová verze začne tu starou předhánět.
@@mjetdevelopment díky za vysvětlení, tryska má tedy největší výkon ve statickém stavu a počítám že by to mnělo být 1,3kw.
@@technicbuilder6410 Výkon je nejvyšší ve statickém stavu. Ale počítá se jako 1/2 * hmotnostní tok * rychlost na druhou v m/s, což je vlastně kinetická energie vody vystříklé za 1s, výsledek je 667 W.
@@mjetdevelopment jasně, díky za upřesnění
WOW what a video really good editing. Defiantly going to make a M-Jet 35 one summer really got the jet to be the best of the best👍. i have a youtube channel with rc cars if you want to check it out its called Tomabon.
60 bucks for a 3d printing file 😅
60 bucks for 5 years worth of R AND D, countless test prints, experiments with aluminum 3d printing and all while getting a college degree in engineering.
Spend 10 bucks on his first design Mjet30 and you will be quite happy. That design was worth $30 easy.
I really liked the job you done which i also interested. Can i contact you ?
Thanks, yeah! Either you can find me in the M-Jet Facebook group, my name is Štěpán Müller:
facebook.com/groups/623045356071128
Or you can use private message / product support on CGTrader:
www.cgtrader.com/m-jet-development
Hello Stepan. Do you have a private email I can chat with you on? I have an important private question for you.
Hi, yes, please send me a private message on CGTrader. Link to my profile is in the description of this video.
Edit: I added you on facebook.